Engineering work is taking place between Alexandra Palace and Stevenage, closing all lines via Welwyn Garden City overnight from Monday evening until Friday morning.
Between 23:59 and 05:10 each night, buses will replace trains between Alexandra Palace and Stevenage via Welwyn Garden City.
Trains between London and Cambridge / Peterborough / Kings Lynn will be diverted to run non-stop via Hertford North, with extended journey times.
Check before you travel:
You can plan your journey using the National Rail Enquiries Journey Planner.
Replacement bus travel advice:
For helpful advice if you need to travel on a rail replacement service, including accessibility and bicycle information, please use our Rail Replacement Services page.
You can find the pick-up and drop-off location of rail replacement services by checking station signage or by searching for your station on our Find a Station page.
Please be advised that replacement vehicles may be busier than usual, and you should allow extra time for your journey.